My Sierra started having throttle problems just before a scheduled camp outing. You would push the pedal to accelerate and the response was delayed and weak. Parts Geek not only had the part I needed but beat Napa by $47.00. It arrived two days sooner than expected and I installed it 20 minutes before I had to leave. New part solved the problem and worked perfectly. My mileage has even gone up.Thank you Parts Geek.